1b59618ce4
https://source.android.com/docs/security/bulletin/2023-09-01 * tag 'ASB-2023-09-05_4.19-stable' of https://android.googlesource.com/kernel/common: Linux 4.19.294 Revert "ARM: ep93xx: fix missing-prototype warnings" Revert "MIPS: Alchemy: fix dbdma2" Linux 4.19.293 dma-buf/sw_sync: Avoid recursive lock during fence signal clk: Fix undefined reference to `clk_rate_exclusive_{get,put}' scsi: core: raid_class: Remove raid_component_add() scsi: snic: Fix double free in snic_tgt_create() irqchip/mips-gic: Don't touch vl_map if a local interrupt is not routable rtnetlink: Reject negative ifindexes in RTM_NEWLINK netfilter: nf_queue: fix socket leak sched/rt: pick_next_rt_entity(): check list_entry mmc: block: Fix in_flight[issue_type] value error x86/fpu: Set X86_FEATURE_OSXSAVE feature after enabling OSXSAVE in CR4 PCI: acpiphp: Use pci_assign_unassigned_bridge_resources() only for non-root bus media: vcodec: Fix potential array out-of-bounds in encoder queue_setup lib/clz_ctz.c: Fix __clzdi2() and __ctzdi2() for 32-bit kernels batman-adv: Fix batadv_v_ogm_aggr_send memory leak batman-adv: Fix TT global entry leak when client roamed back batman-adv: Do not get eth header before batadv_check_management_packet batman-adv: Don't increase MTU when set by user batman-adv: Trigger events for auto adjusted MTU nfsd: Fix race to FREE_STATEID and cl_revoked ibmveth: Use dcbf rather than dcbfl ipvs: fix racy memcpy in proc_do_sync_threshold ipvs: Improve robustness to the ipvs sysctl bonding: fix macvlan over alb bond support net: remove bond_slave_has_mac_rcu() net/sched: fix a qdisc modification with ambiguous command request igb: Avoid starting unnecessary workqueues dccp: annotate data-races in dccp_poll() sock: annotate data-races around prot->memory_pressure tracing: Fix memleak due to race between current_tracer and trace drm/amd/display: check TG is non-null before checking if enabled drm/amd/display: do not wait for mpc idle if tg is disabled regmap: Account for register length in SMBus I/O limits dm integrity: reduce vmalloc space footprint on 32-bit architectures dm integrity: increase RECALC_SECTORS to improve recalculate speed powerpc: Fail build if using recordmcount with binutils v2.37 powerpc: remove leftover code of old GCC version checks powerpc/32: add stack protector support fbdev: fix potential OOB read in fast_imageblit() fbdev: Fix sys_imageblit() for arbitrary image widths fbdev: Improve performance of sys_imageblit() tty: serial: fsl_lpuart: add earlycon for imx8ulp platform Revert "tty: serial: fsl_lpuart: drop earlycon entry for i.MX8QXP" MIPS: cpu-features: Use boot_cpu_type for CPU type based features MIPS: cpu-features: Enable octeon_cache by cpu_type fs: dlm: fix mismatch of plock results from userspace fs: dlm: use dlm_plock_info for do_unlock_close fs: dlm: change plock interrupted message to debug again fs: dlm: add pid to debug log dlm: replace usage of found with dedicated list iterator variable dlm: improve plock logging if interrupted PCI: acpiphp: Reassign resources on bridge if necessary net: phy: broadcom: stub c45 read/write for 54810 net: xfrm: Amend XFRMA_SEC_CTX nla_policy structure net: fix the RTO timer retransmitting skb every 1ms if linear option is enabled virtio-net: set queues after driver_ok af_unix: Fix null-ptr-deref in unix_stream_sendpage(). netfilter: set default timeout to 3 secs for sctp shutdown send and recv state test_firmware: prevent race conditions by a correct implementation of locking mmc: wbsd: fix double mmc_free_host() in wbsd_init() cifs: Release folio lock on fscache read hit. ALSA: usb-audio: Add support for Mythware XA001AU capture and playback interfaces. serial: 8250: Fix oops for port->pm on uart_change_pm() ASoC: meson: axg-tdm-formatter: fix channel slot allocation ASoC: rt5665: add missed regulator_bulk_disable net: do not allow gso_size to be set to GSO_BY_FRAGS sock: Fix misuse of sk_under_memory_pressure() i40e: fix misleading debug logs team: Fix incorrect deletion of ETH_P_8021AD protocol vid from slaves netfilter: nft_dynset: disallow object maps selftests: mirror_gre_changes: Tighten up the TTL test match xfrm: add NULL check in xfrm_update_ae_params ip_vti: fix potential slab-use-after-free in decode_session6 ip6_vti: fix slab-use-after-free in decode_session6 xfrm: fix slab-use-after-free in decode_session6 xfrm: interface: rename xfrm_interface.c to xfrm_interface_core.c net: af_key: fix sadb_x_filter validation net: xfrm: Fix xfrm_address_filter OOB read btrfs: fix BUG_ON condition in btrfs_cancel_balance powerpc/rtas_flash: allow user copy to flash block cache objects fbdev: mmp: fix value check in mmphw_probe() virtio-mmio: don't break lifecycle of vm_dev virtio-mmio: Use to_virtio_mmio_device() to simply code virtio-mmio: convert to devm_platform_ioremap_resource nfsd: Remove incorrect check in nfsd4_validate_stateid nfsd4: kill warnings on testing stateids with mismatched clientids block: fix signed int overflow in Amiga partition support mmc: sunxi: fix deferred probing mmc: bcm2835: fix deferred probing mmc: Remove dev_err() usage after platform_get_irq() mmc: tmio: move tmio_mmc_set_clock() to platform hook mmc: tmio: replace tmio_mmc_clk_stop() calls with tmio_mmc_set_clock() mmc: meson-gx: remove redundant mmc_request_done() call from irq context mmc: meson-gx: remove useless lock USB: dwc3: qcom: fix NULL-deref on suspend usb: dwc3: qcom: Add helper functions to enable,disable wake irqs irqchip/mips-gic: Use raw spinlock for gic_lock irqchip/mips-gic: Get rid of the reliance on irq_cpu_online() x86/topology: Fix erroneous smp_num_siblings on Intel Hybrid platforms powerpc/64s/radix: Fix soft dirty tracking powerpc: Move page table dump files in a dedicated subdirectory powerpc/mm: dump block address translation on book3s/32 powerpc/mm: dump segment registers on book3s/32 powerpc/mm: Move pgtable_t into platform headers powerpc/mm: move platform specific mmu-xxx.h in platform directories iio: addac: stx104: Fix race condition when converting analog-to-digital iio: addac: stx104: Fix race condition for stx104_write_raw() iio: adc: stx104: Implement and utilize register structures iio: adc: stx104: Utilize iomap interface iio: add addac subdirectory IMA: allow/fix UML builds drm/amdgpu: Fix potential fence use-after-free v2 Bluetooth: L2CAP: Fix use-after-free pcmcia: rsrc_nonstatic: Fix memory leak in nonstatic_release_resource_db() gfs2: Fix possible data races in gfs2_show_options() media: platform: mediatek: vpu: fix NULL ptr dereference media: v4l2-mem2mem: add lock to protect parameter num_rdy FS: JFS: Check for read-only mounted filesystem in txBegin FS: JFS: Fix null-ptr-deref Read in txBegin MIPS: dec: prom: Address -Warray-bounds warning fs: jfs: Fix UBSAN: array-index-out-of-bounds in dbAllocDmapLev udf: Fix uninitialized array access for some pathnames HID: add quirk for 03f0:464a HP Elite Presenter Mouse quota: fix warning in dqgrab() quota: Properly disable quotas when add_dquot_ref() fails ALSA: emu10k1: roll up loops in DSP setup code for Audigy drm/radeon: Fix integer overflow in radeon_cs_parser_init selftests: forwarding: tc_flower: Relax success criterion lib/mpi: Eliminate unused umul_ppmm definitions for MIPS Revert "posix-timers: Ensure timer ID search-loop limit is valid" UPSTREAM: media: usb: siano: Fix warning due to null work_func_t function pointer UPSTREAM: Bluetooth: L2CAP: Fix use-after-free in l2cap_sock_ready_cb UPSTREAM: net/sched: cls_route: No longer copy tcf_result on update to avoid use-after-free UPSTREAM: net/sched: cls_u32: No longer copy tcf_result on update to avoid use-after-free Linux 4.19.292 sch_netem: fix issues in netem_change() vs get_dist_table() alpha: remove __init annotation from exported page_is_ram() scsi: core: Fix possible memory leak if device_add() fails scsi: snic: Fix possible memory leak if device_add() fails scsi: 53c700: Check that command slot is not NULL scsi: storvsc: Fix handling of virtual Fibre Channel timeouts scsi: core: Fix legacy /proc parsing buffer overflow netfilter: nf_tables: report use refcount overflow netfilter: nf_tables: bogus EBUSY when deleting flowtable after flush btrfs: don't stop integrity writeback too early ibmvnic: Handle DMA unmapping of login buffs in release functions wifi: cfg80211: fix sband iftype data lookup for AP_VLAN IB/hfi1: Fix possible panic during hotplug remove drivers: net: prevent tun_build_skb() to exceed the packet size limit dccp: fix data-race around dp->dccps_mss_cache bonding: Fix incorrect deletion of ETH_P_8021AD protocol vid from slaves net/packet: annotate data-races around tp->status mISDN: Update parameter type of dsp_cmx_send() drm/nouveau/disp: Revert a NULL check inside nouveau_connector_get_modes x86: Move gds_ucode_mitigated() declaration to header x86/mm: Fix VDSO and VVAR placement on 5-level paging machines x86/cpu/amd: Enable Zenbleed fix for AMD Custom APU 0405 usb: dwc3: Properly handle processing of pending events usb-storage: alauda: Fix uninit-value in alauda_check_media() binder: fix memory leak in binder_init() iio: cros_ec: Fix the allocation size for cros_ec_command nilfs2: fix use-after-free of nilfs_root in dirtying inodes via iput radix tree test suite: fix incorrect allocation size for pthreads drm/nouveau/gr: enable memory loads on helper invocation on all channels dmaengine: pl330: Return DMA_PAUSED when transaction is paused ipv6: adjust ndisc_is_useropt() to also return true for PIO mmc: moxart: read scr register without changing byte order sparc: fix up arch_cpu_finalize_init() build breakage. UPSTREAM: net/sched: cls_fw: Fix improper refcount update leads to use-after-free Linux 4.19.291 drm/edid: fix objtool warning in drm_cvt_modes() arm64: dts: stratix10: fix incorrect I2C property for SCL signal drivers core: Use sysfs_emit and sysfs_emit_at for show(device *...) functions ARM: dts: nxp/imx6sll: fix wrong property name in usbphy node ARM: dts: imx6sll: fixup of operating points ARM: dts: imx: add usb alias ARM: dts: imx6sll: Make ssi node name same as other platforms PM: sleep: wakeirq: fix wake irq arming PM / wakeirq: support enabling wake-up irq after runtime_suspend called powerpc/mm/altmap: Fix altmap boundary check mtd: rawnand: omap_elm: Fix incorrect type in assignment test_firmware: return ENOMEM instead of ENOSPC on failed memory allocation test_firmware: fix a memory leak with reqs buffer ext2: Drop fragment support net: usbnet: Fix WARNING in usbnet_start_xmit/usb_submit_urb Bluetooth: L2CAP: Fix use-after-free in l2cap_sock_ready_cb fs/sysv: Null check to prevent null-ptr-deref bug USB: zaurus: Add ID for A-300/B-500/C-700 libceph: fix potential hang in ceph_osdc_notify() scsi: zfcp: Defer fc_rport blocking until after ADISC response tcp_metrics: fix data-race in tcpm_suck_dst() vs fastopen tcp_metrics: annotate data-races around tm->tcpm_net tcp_metrics: annotate data-races around tm->tcpm_vals[] tcp_metrics: annotate data-races around tm->tcpm_lock tcp_metrics: annotate data-races around tm->tcpm_stamp tcp_metrics: fix addr_same() helper ip6mr: Fix skb_under_panic in ip6mr_cache_report() net/sched: cls_route: No longer copy tcf_result on update to avoid use-after-free net/sched: cls_u32: No longer copy tcf_result on update to avoid use-after-free net: add missing data-race annotation for sk_ll_usec net: add missing data-race annotations around sk->sk_peek_off net: sched: cls_u32: Fix match key mis-addressing perf test uprobe_from_different_cu: Skip if there is no gcc net/mlx5e: fix return value check in mlx5e_ipsec_remove_trailer() KVM: s390: fix sthyi error handling word-at-a-time: use the same return type for has_zero regardless of endianness loop: Select I/O scheduler 'none' from inside add_disk() perf: Fix function pointer case net/sched: cls_u32: Fix reference counter leak leading to overflow ASoC: cs42l51: fix driver to properly autoload with automatic module loading net/sched: sch_qfq: account for stab overhead in qfq_enqueue net/sched: cls_fw: Fix improper refcount update leads to use-after-free drm/client: Fix memory leak in drm_client_target_cloned dm cache policy smq: ensure IO doesn't prevent cleaner policy progress ASoC: wm8904: Fill the cache for WM8904_ADC_TEST_0 register s390/dasd: fix hanging device after quiesce/resume virtio-net: fix race between set queues and probe serial: 8250_dw: Preserve original value of DLF register serial: 8250_dw: split Synopsys DesignWare 8250 common functions irq-bcm6345-l1: Do not assume a fixed block to cpu mapping tpm_tis: Explicitly check for error code btrfs: check for commit error at btrfs_attach_transaction_barrier() hwmon: (nct7802) Fix for temp6 (PECI1) processed even if PECI1 disabled staging: ks7010: potential buffer overflow in ks_wlan_set_encode_ext() Documentation: security-bugs.rst: clarify CVE handling Documentation: security-bugs.rst: update preferences when dealing with the linux-distros group usb: xhci-mtk: set the dma max_seg_size USB: quirks: add quirk for Focusrite Scarlett usb: ohci-at91: Fix the unhandle interrupt when resume usb: dwc3: don't reset device side if dwc3 was configured as host-only usb: dwc3: pci: skip BYT GPIO lookup table for hardwired phy Revert "usb: dwc3: core: Enable AutoRetry feature in the controller" can: gs_usb: gs_can_close(): add missing set of CAN state to CAN_STATE_STOPPED USB: serial: simple: sort driver entries USB: serial: simple: add Kaufmann RKS+CAN VCP USB: serial: option: add Quectel EC200A module support USB: serial: option: support Quectel EM060K_128 tracing: Fix warning in trace_buffered_event_disable() ring-buffer: Fix wrong stat of cpu_buffer->read ata: pata_ns87415: mark ns87560_tf_read static dm raid: fix missing reconfig_mutex unlock in raid_ctr() error paths block: Fix a source code comment in include/uapi/linux/blkzoned.h ASoC: fsl_spdif: Silence output on stop drm/msm: Fix IS_ERR_OR_NULL() vs NULL check in a5xx_submit_in_rb() RDMA/mlx4: Make check for invalid flags stricter benet: fix return value check in be_lancer_xmit_workarounds() net/sched: mqprio: Add length check for TCA_MQPRIO_{MAX/MIN}_RATE64 net/sched: mqprio: add extack to mqprio_parse_nlattr() net/sched: mqprio: refactor nlattr parsing to a separate function platform/x86: msi-laptop: Fix rfkill out-of-sync on MSI Wind U100 team: reset team's flags when down link is P2P device bonding: reset bond's flags when down link is P2P device tcp: Reduce chance of collisions in inet6_hashfn(). ipv6 addrconf: fix bug where deleting a mngtmpaddr can create a new temporary address ethernet: atheros: fix return value check in atl1e_tso_csum() phy: hisilicon: Fix an out of bounds check in hisi_inno_phy_probe() i40e: Fix an NULL vs IS_ERR() bug for debugfs_create_dir() ext4: fix to check return value of freeze_bdev() in ext4_shutdown() scsi: qla2xxx: Array index may go out of bound scsi: qla2xxx: Fix inconsistent format argument type in qla_os.c ftrace: Fix possible warning on checking all pages used in ftrace_process_locs() ftrace: Store the order of pages allocated in ftrace_page ftrace: Check if pages were allocated before calling free_pages() ftrace: Add information on number of page groups allocated fs: dlm: interrupt posix locks only when process is killed dlm: rearrange async condition return dlm: cleanup plock_op vs plock_xop PCI/ASPM: Avoid link retraining race PCI/ASPM: Factor out pcie_wait_for_retrain() PCI/ASPM: Return 0 or -ETIMEDOUT from pcie_retrain_link() PCI: Rework pcie_retrain_link() wait loop ext4: Fix reusing stale buffer heads from last failed mounting ext4: rename journal_dev to s_journal_dev inside ext4_sb_info btrfs: fix extent buffer leak after tree mod log failure at split_node() bcache: Fix __bch_btree_node_alloc to make the failure behavior consistent bcache: remove 'int n' from parameter list of bch_bucket_alloc_set() bcache: use MAX_CACHES_PER_SET instead of magic number 8 in __bch_bucket_alloc_set gpio: tps68470: Make tps68470_gpio_output() always set the initial value tracing/histograms: Return an error if we fail to add histogram to hist_vars list tcp: annotate data-races around fastopenq.max_qlen tcp: annotate data-races around tp->notsent_lowat tcp: annotate data-races around rskq_defer_accept tcp: annotate data-races around tp->linger2 net: Replace the limit of TCP_LINGER2 with TCP_FIN_TIMEOUT_MAX netfilter: nf_tables: can't schedule in nft_chain_validate netfilter: nf_tables: fix spurious set element insertion failure llc: Don't drop packet from non-root netns. fbdev: au1200fb: Fix missing IRQ check in au1200fb_drv_probe Revert "tcp: avoid the lookup process failing to get sk in ehash table" net:ipv6: check return value of pskb_trim() net: ethernet: ti: cpsw_ale: Fix cpsw_ale_get_field()/cpsw_ale_set_field() pinctrl: amd: Use amd_pinconf_set() for all config options fbdev: imxfb: warn about invalid left/right margin spi: bcm63xx: fix max prepend length igb: Fix igb_down hung on surprise removal wifi: iwlwifi: mvm: avoid baid size integer overflow wifi: wext-core: Fix -Wstringop-overflow warning in ioctl_standard_iw_point() bpf: Address KCSAN report on bpf_lru_list sched/fair: Don't balance task to its current running CPU posix-timers: Ensure timer ID search-loop limit is valid md/raid10: prevent soft lockup while flush writes md: fix data corruption for raid456 when reshape restart while grow up nbd: Add the maximum limit of allocated index in nbd_dev_add debugobjects: Recheck debug_objects_enabled before reporting ext4: correct inline offset when handling xattrs in inode body can: bcm: Fix UAF in bcm_proc_show() fuse: revalidate: don't invalidate if interrupted perf probe: Add test for regression introduced by switch to die_get_decl_file() tracing/histograms: Add histograms to hist_vars if they have referenced variables drm/atomic: Fix potential use-after-free in nonblocking commits scsi: qla2xxx: Pointer may be dereferenced scsi: qla2xxx: Check valid rport returned by fc_bsg_to_rport() scsi: qla2xxx: Fix potential NULL pointer dereference scsi: qla2xxx: Wait for io return on terminate rport xtensa: ISS: fix call to split_if_spec ring-buffer: Fix deadloop issue on reading trace_pipe tty: serial: samsung_tty: Fix a memory leak in s3c24xx_serial_getclk() when iterating clk tty: serial: samsung_tty: Fix a memory leak in s3c24xx_serial_getclk() in case of error Revert "8250: add support for ASIX devices with a FIFO bug" meson saradc: fix clock divider mask length ceph: don't let check_caps skip sending responses for revoke msgs hwrng: imx-rngc - fix the timeout for init and self check serial: atmel: don't enable IRQs prematurely fs: dlm: return positive pid value for F_GETLK md/raid0: add discard support for the 'original' layout misc: pci_endpoint_test: Re-init completion for every test misc: pci_endpoint_test: Free IRQs before removing the device PCI: rockchip: Use u32 variable to access 32-bit registers PCI: rockchip: Fix legacy IRQ generation for RK3399 PCIe endpoint core PCI: rockchip: Add poll and timeout to wait for PHY PLLs to be locked PCI: rockchip: Write PCI Device ID to correct register PCI: rockchip: Assert PCI Configuration Enable bit after probe PCI: qcom: Disable write access to read only registers for IP v2.3.3 PCI: Add function 1 DMA alias quirk for Marvell 88SE9235 PCI/PM: Avoid putting EloPOS E2/S2/H2 PCIe Ports in D3cold jfs: jfs_dmap: Validate db_l2nbperpage while mounting ext4: only update i_reserved_data_blocks on successful block allocation ext4: fix wrong unit use in ext4_mb_clear_bb perf intel-pt: Fix CYC timestamps after standalone CBR SUNRPC: Fix UAF in svc_tcp_listen_data_ready() net: bcmgenet: Ensure MDIO unregistration has clocks enabled tpm: tpm_vtpm_proxy: fix a race condition in /dev/vtpmx creation pinctrl: amd: Only use special debounce behavior for GPIO 0 pinctrl: amd: Detect internal GPIO0 debounce handling pinctrl: amd: Fix mistake in handling clearing pins at startup net/sched: make psched_mtu() RTNL-less safe wifi: airo: avoid uninitialized warning in airo_get_rate() ipv6/addrconf: fix a potential refcount underflow for idev NTB: ntb_tool: Add check for devm_kcalloc NTB: ntb_transport: fix possible memory leak while device_register() fails ntb: intel: Fix error handling in intel_ntb_pci_driver_init() NTB: amd: Fix error handling in amd_ntb_pci_driver_init() ntb: idt: Fix error handling in idt_pci_driver_init() udp6: fix udp6_ehashfn() typo icmp6: Fix null-ptr-deref of ip6_null_entry->rt6i_idev in icmp6_dev(). vrf: Increment Icmp6InMsgs on the original netdev net: mvneta: fix txq_map in case of txq_number==1 workqueue: clean up WORK_* constant types, clarify masking net: lan743x: Don't sleep in atomic context netfilter: nf_tables: prevent OOB access in nft_byteorder_eval netfilter: conntrack: Avoid nf_ct_helper_hash uses after free netfilter: nf_tables: fix scheduling-while-atomic splat netfilter: nf_tables: unbind non-anonymous set if rule construction fails netfilter: nf_tables: reject unbound anonymous set before commit phase netfilter: nf_tables: add NFT_TRANS_PREPARE_ERROR to deal with bound set/chain netfilter: nf_tables: incorrect error path handling with NFT_MSG_NEWRULE netfilter: nf_tables: use net_generic infra for transaction data netfilter: add helper function to set up the nfnetlink header and use it netfilter: nftables: add helper function to set the base sequence number netfilter: nf_tables: add rescheduling points during loop detection walks netfilter: nf_tables: fix nat hook table deletion spi: spi-fsl-spi: allow changing bits_per_word while CS is still active spi: spi-fsl-spi: relax message sanity checking a little spi: spi-fsl-spi: remove always-true conditional in fsl_spi_do_one_msg ARM: orion5x: fix d2net gpio initialization btrfs: fix race when deleting quota root from the dirty cow roots list jffs2: reduce stack usage in jffs2_build_xattr_subsystem() integrity: Fix possible multiple allocation in integrity_inode_get() bcache: Remove unnecessary NULL point check in node allocations mmc: core: disable TRIM on Micron MTFC4GACAJCN-1M mmc: core: disable TRIM on Kingston EMMC04G-M627 NFSD: add encoding of op_recall flag for write delegation ALSA: jack: Fix mutex call in snd_jack_report() i2c: xiic: Don't try to handle more interrupt events after error i2c: xiic: Defer xiic_wakeup() and __xiic_start_xfer() in xiic_process() sh: dma: Fix DMA channel offset calculation net/sched: act_pedit: Add size check for TCA_PEDIT_PARMS_EX tcp: annotate data races in __tcp_oow_rate_limited() net: bridge: keep ports without IFF_UNICAST_FLT in BR_PROMISC mode powerpc: allow PPC_EARLY_DEBUG_CPM only when SERIAL_CPM=y f2fs: fix error path handling in truncate_dnode() mailbox: ti-msgmgr: Fill non-message tx data fields with 0x0 spi: bcm-qspi: return error if neither hif_mspi nor mspi is available Add MODULE_FIRMWARE() for FIRMWARE_TG357766. sctp: fix potential deadlock on &net->sctp.addr_wq_lock rtc: st-lpc: Release some resources in st_rtc_probe() in case of error mfd: stmpe: Only disable the regulators if they are enabled mfd: intel-lpss: Add missing check for platform_get_resource KVM: s390: fix KVM_S390_GET_CMMA_BITS for GFNs in memslot holes mfd: rt5033: Drop rt5033-battery sub-device usb: phy: phy-tahvo: fix memory leak in tahvo_usb_probe() extcon: Fix kernel doc of property capability fields to avoid warnings extcon: Fix kernel doc of property fields to avoid warnings media: usb: siano: Fix warning due to null work_func_t function pointer media: videodev2.h: Fix struct v4l2_input tuner index comment media: usb: Check az6007_read() return value sh: j2: Use ioremap() to translate device tree address into kernel memory w1: fix loop in w1_fini() block: change all __u32 annotations to __be32 in affs_hardblocks.h USB: serial: option: add LARA-R6 01B PIDs ARC: define ASM_NL and __ALIGN(_STR) outside #ifdef __ASSEMBLY__ guard ARCv2: entry: rewrite to enable use of double load/stores LDD/STD ARCv2: entry: avoid a branch ARCv2: entry: push out the Z flag unclobber from common EXCEPTION_PROLOGUE ARCv2: entry: comments about hardware auto-save on taken interrupts modpost: fix section mismatch message for R_ARM_{PC24,CALL,JUMP24} modpost: fix section mismatch message for R_ARM_ABS32 crypto: nx - fix build warnings when DEBUG_FS is not enabled hwrng: virtio - Fix race on data_avail and actual data hwrng: virtio - always add a pending request hwrng: virtio - don't waste entropy hwrng: virtio - don't wait on cleanup hwrng: virtio - add an internal buffer pinctrl: at91-pio4: check return value of devm_kasprintf() perf dwarf-aux: Fix off-by-one in die_get_varname() pinctrl: cherryview: Return correct value if pin in push-pull mode PCI: Add pci_clear_master() stub for non-CONFIG_PCI scsi: 3w-xxxx: Add error handling for initialization failure in tw_probe() ALSA: ac97: Fix possible NULL dereference in snd_ac97_mixer drm/radeon: fix possible division-by-zero errors fbdev: omapfb: lcd_mipid: Fix an error handling path in mipid_spi_probe() arm64: dts: renesas: ulcb-kf: Remove flow control for SCIF1 IB/hfi1: Fix sdma.h tx->num_descs off-by-one errors soc/fsl/qe: fix usb.c build errors ASoC: es8316: Increment max value for ALC Capture Target Volume control ARM: ep93xx: fix missing-prototype warnings drm/panel: simple: fix active size for Ampire AM-480272H3TMQW-T01H Input: adxl34x - do not hardcode interrupt trigger type ARM: dts: BCM5301X: Drop "clock-names" from the SPI node Input: drv260x - sleep between polling GO bit radeon: avoid double free in ci_dpm_init() netlink: Add __sock_i_ino() for __netlink_diag_dump(). ipvlan: Fix return value of ipvlan_queue_xmit() netfilter: nf_conntrack_sip: fix the ct_sip_parse_numerical_param() return value. lib/ts_bm: reset initial match offset for every block of text gtp: Fix use-after-free in __gtp_encap_destroy(). netlink: do not hard code device address lenth in fdb dumps netlink: fix potential deadlock in netlink_set_err() wifi: ath9k: convert msecs to jiffies where needed wifi: ath9k: Fix possible stall on ath9k_txq_list_has_key() memstick r592: make memstick_debug_get_tpc_name() static kexec: fix a memory leak in crash_shrink_memory() watchdog/perf: more properly prevent false positives with turbo modes watchdog/perf: define dummy watchdog_update_hrtimer_threshold() on correct config wifi: rsi: Do not set MMC_PM_KEEP_POWER in shutdown wifi: ath9k: don't allow to overwrite ENDPOINT0 attributes wifi: ray_cs: Fix an error handling path in ray_probe() wifi: ray_cs: Drop useless status variable in parse_addr() wifi: ray_cs: Utilize strnlen() in parse_addr() wifi: wl3501_cs: Fix an error handling path in wl3501_probe() wl3501_cs: use eth_hw_addr_set() net: create netdev->dev_addr assignment helpers wl3501_cs: Fix misspelling and provide missing documentation wl3501_cs: Remove unnecessary NULL check wl3501_cs: Fix a bunch of formatting issues related to function docs wifi: atmel: Fix an error handling path in atmel_probe() wifi: orinoco: Fix an error handling path in orinoco_cs_probe() wifi: orinoco: Fix an error handling path in spectrum_cs_probe() nfc: llcp: fix possible use of uninitialized variable in nfc_llcp_send_connect() nfc: constify several pointers to u8, char and sk_buff wifi: mwifiex: Fix the size of a memory allocation in mwifiex_ret_802_11_scan() samples/bpf: Fix buffer overflow in tcp_basertt wifi: ath9k: avoid referencing uninit memory in ath9k_wmi_ctrl_rx wifi: ath9k: fix AR9003 mac hardware hang check register offset calculation evm: Complete description of evm_inode_setattr() ARM: 9303/1: kprobes: avoid missing-declaration warnings PM: domains: fix integer overflow issues in genpd_parse_state() clocksource/drivers/cadence-ttc: Fix memory leak in ttc_timer_probe clocksource/drivers/cadence-ttc: Use ttc driver as platform driver clocksource/drivers: Unify the names to timer-* format irqchip/jcore-aic: Fix missing allocation of IRQ descriptors irqchip/jcore-aic: Kill use of irq_create_strict_mappings() md/raid10: fix io loss while replacement replace rdev md/raid10: fix wrong setting of max_corr_read_errors md/raid10: fix overflow of md/safe_mode_delay md/raid10: check slab-out-of-bounds in md_bitmap_get_counter treewide: Remove uninitialized_var() usage drm/amdgpu: Validate VM ioctl flags. scripts/tags.sh: Resolve gtags empty index generation drm/edid: Fix uninitialized variable in drm_cvt_modes() fbdev: imsttfb: Fix use after free bug in imsttfb_probe video: imsttfb: check for ioremap() failures x86/smp: Use dedicated cache-line for mwait_play_dead() gfs2: Don't deref jdesc in evict Linux 4.19.290 x86: fix backwards merge of GDS/SRSO bit xen/netback: Fix buffer overrun triggered by unusual packet Documentation/x86: Fix backwards on/off logic about YMM support x86/xen: Fix secondary processors' FPU initialization KVM: Add GDS_NO support to KVM x86/speculation: Add Kconfig option for GDS x86/speculation: Add force option to GDS mitigation x86/speculation: Add Gather Data Sampling mitigation x86/fpu: Move FPU initialization into arch_cpu_finalize_init() x86/fpu: Mark init functions __init x86/fpu: Remove cpuinfo argument from init functions init, x86: Move mem_encrypt_init() into arch_cpu_finalize_init() init: Invoke arch_cpu_finalize_init() earlier init: Remove check_bugs() leftovers um/cpu: Switch to arch_cpu_finalize_init() sparc/cpu: Switch to arch_cpu_finalize_init() sh/cpu: Switch to arch_cpu_finalize_init() mips/cpu: Switch to arch_cpu_finalize_init() m68k/cpu: Switch to arch_cpu_finalize_init() ia64/cpu: Switch to arch_cpu_finalize_init() ARM: cpu: Switch to arch_cpu_finalize_init() x86/cpu: Switch to arch_cpu_finalize_init() init: Provide arch_cpu_finalize_init() Conflicts: drivers/mmc/core/block.c drivers/mmc/host/sdhci-msm.c drivers/usb/dwc3/core.c drivers/usb/dwc3/gadget.c Change-Id: Id2f4d5c8067f8e5eda39c0eaa5e59d54a394b4c7
1834 lines
46 KiB
C
1834 lines
46 KiB
C
/*
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* linux/kernel/exit.c
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*
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* Copyright (C) 1991, 1992 Linus Torvalds
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*/
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#include <linux/mm.h>
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#include <linux/slab.h>
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#include <linux/sched/autogroup.h>
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#include <linux/sched/mm.h>
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#include <linux/sched/stat.h>
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#include <linux/sched/task.h>
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#include <linux/sched/task_stack.h>
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#include <linux/sched/cputime.h>
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#include <linux/interrupt.h>
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#include <linux/module.h>
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#include <linux/capability.h>
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#include <linux/completion.h>
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#include <linux/personality.h>
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#include <linux/tty.h>
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#include <linux/iocontext.h>
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#include <linux/key.h>
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#include <linux/cpu.h>
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#include <linux/acct.h>
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#include <linux/tsacct_kern.h>
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#include <linux/file.h>
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#include <linux/fdtable.h>
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#include <linux/freezer.h>
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#include <linux/binfmts.h>
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#include <linux/nsproxy.h>
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#include <linux/pid_namespace.h>
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#include <linux/ptrace.h>
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#include <linux/profile.h>
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#include <linux/mount.h>
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#include <linux/proc_fs.h>
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#include <linux/kthread.h>
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#include <linux/mempolicy.h>
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#include <linux/taskstats_kern.h>
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#include <linux/delayacct.h>
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#include <linux/cgroup.h>
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#include <linux/syscalls.h>
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#include <linux/signal.h>
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#include <linux/posix-timers.h>
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#include <linux/cn_proc.h>
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#include <linux/mutex.h>
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#include <linux/futex.h>
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#include <linux/pipe_fs_i.h>
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#include <linux/audit.h> /* for audit_free() */
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#include <linux/resource.h>
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#include <linux/blkdev.h>
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#include <linux/task_io_accounting_ops.h>
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#include <linux/tracehook.h>
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#include <linux/fs_struct.h>
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#include <linux/init_task.h>
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#include <linux/perf_event.h>
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#include <trace/events/sched.h>
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#include <linux/hw_breakpoint.h>
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#include <linux/oom.h>
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#include <linux/writeback.h>
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#include <linux/shm.h>
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#include <linux/kcov.h>
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#include <linux/random.h>
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#include <linux/rcuwait.h>
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#include <linux/compat.h>
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#include <linux/sysfs.h>
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#include <linux/uaccess.h>
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#include <asm/unistd.h>
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#include <asm/pgtable.h>
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#include <asm/mmu_context.h>
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/*
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* The default value should be high enough to not crash a system that randomly
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* crashes its kernel from time to time, but low enough to at least not permit
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* overflowing 32-bit refcounts or the ldsem writer count.
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*/
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static unsigned int oops_limit = 10000;
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#ifdef CONFIG_SYSCTL
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static struct ctl_table kern_exit_table[] = {
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{
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.procname = "oops_limit",
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.data = &oops_limit,
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.maxlen = sizeof(oops_limit),
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.mode = 0644,
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.proc_handler = proc_douintvec,
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},
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{ }
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};
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static __init int kernel_exit_sysctls_init(void)
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{
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register_sysctl_init("kernel", kern_exit_table);
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return 0;
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}
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late_initcall(kernel_exit_sysctls_init);
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#endif
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static atomic_t oops_count = ATOMIC_INIT(0);
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#ifdef CONFIG_SYSFS
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static ssize_t oops_count_show(struct kobject *kobj, struct kobj_attribute *attr,
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char *page)
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{
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return sysfs_emit(page, "%d\n", atomic_read(&oops_count));
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}
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static struct kobj_attribute oops_count_attr = __ATTR_RO(oops_count);
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static __init int kernel_exit_sysfs_init(void)
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{
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sysfs_add_file_to_group(kernel_kobj, &oops_count_attr.attr, NULL);
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return 0;
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}
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late_initcall(kernel_exit_sysfs_init);
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#endif
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static void __unhash_process(struct task_struct *p, bool group_dead)
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{
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nr_threads--;
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detach_pid(p, PIDTYPE_PID);
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if (group_dead) {
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detach_pid(p, PIDTYPE_TGID);
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detach_pid(p, PIDTYPE_PGID);
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detach_pid(p, PIDTYPE_SID);
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list_del_rcu(&p->tasks);
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list_del_init(&p->sibling);
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__this_cpu_dec(process_counts);
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}
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list_del_rcu(&p->thread_group);
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list_del_rcu(&p->thread_node);
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}
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/*
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* This function expects the tasklist_lock write-locked.
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*/
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static void __exit_signal(struct task_struct *tsk)
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{
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struct signal_struct *sig = tsk->signal;
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bool group_dead = thread_group_leader(tsk);
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struct sighand_struct *sighand;
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struct tty_struct *tty;
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u64 utime, stime;
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sighand = rcu_dereference_check(tsk->sighand,
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lockdep_tasklist_lock_is_held());
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spin_lock(&sighand->siglock);
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#ifdef CONFIG_POSIX_TIMERS
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posix_cpu_timers_exit(tsk);
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if (group_dead) {
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posix_cpu_timers_exit_group(tsk);
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} else {
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/*
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* This can only happen if the caller is de_thread().
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* FIXME: this is the temporary hack, we should teach
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* posix-cpu-timers to handle this case correctly.
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*/
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if (unlikely(has_group_leader_pid(tsk)))
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posix_cpu_timers_exit_group(tsk);
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}
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#endif
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if (group_dead) {
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tty = sig->tty;
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sig->tty = NULL;
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} else {
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/*
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* If there is any task waiting for the group exit
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* then notify it:
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*/
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if (sig->notify_count > 0 && !--sig->notify_count)
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wake_up_process(sig->group_exit_task);
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if (tsk == sig->curr_target)
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sig->curr_target = next_thread(tsk);
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}
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add_device_randomness((const void*) &tsk->se.sum_exec_runtime,
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sizeof(unsigned long long));
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/*
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* Accumulate here the counters for all threads as they die. We could
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* skip the group leader because it is the last user of signal_struct,
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* but we want to avoid the race with thread_group_cputime() which can
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* see the empty ->thread_head list.
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*/
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task_cputime(tsk, &utime, &stime);
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write_seqlock(&sig->stats_lock);
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sig->utime += utime;
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sig->stime += stime;
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sig->gtime += task_gtime(tsk);
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sig->min_flt += tsk->min_flt;
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sig->maj_flt += tsk->maj_flt;
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sig->nvcsw += tsk->nvcsw;
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sig->nivcsw += tsk->nivcsw;
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sig->inblock += task_io_get_inblock(tsk);
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sig->oublock += task_io_get_oublock(tsk);
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task_io_accounting_add(&sig->ioac, &tsk->ioac);
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sig->sum_sched_runtime += tsk->se.sum_exec_runtime;
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sig->nr_threads--;
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__unhash_process(tsk, group_dead);
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write_sequnlock(&sig->stats_lock);
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/*
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* Do this under ->siglock, we can race with another thread
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* doing sigqueue_free() if we have SIGQUEUE_PREALLOC signals.
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*/
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flush_sigqueue(&tsk->pending);
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tsk->sighand = NULL;
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spin_unlock(&sighand->siglock);
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__cleanup_sighand(sighand);
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clear_tsk_thread_flag(tsk, TIF_SIGPENDING);
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if (group_dead) {
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flush_sigqueue(&sig->shared_pending);
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tty_kref_put(tty);
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}
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}
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static void delayed_put_task_struct(struct rcu_head *rhp)
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{
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struct task_struct *tsk = container_of(rhp, struct task_struct, rcu);
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perf_event_delayed_put(tsk);
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trace_sched_process_free(tsk);
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put_task_struct(tsk);
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}
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void put_task_struct_rcu_user(struct task_struct *task)
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{
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if (refcount_dec_and_test(&task->rcu_users))
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call_rcu(&task->rcu, delayed_put_task_struct);
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}
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void release_task(struct task_struct *p)
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{
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struct task_struct *leader;
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int zap_leader;
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repeat:
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/* don't need to get the RCU readlock here - the process is dead and
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* can't be modifying its own credentials. But shut RCU-lockdep up */
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rcu_read_lock();
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atomic_dec(&__task_cred(p)->user->processes);
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rcu_read_unlock();
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proc_flush_task(p);
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cgroup_release(p);
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write_lock_irq(&tasklist_lock);
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ptrace_release_task(p);
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__exit_signal(p);
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/*
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* If we are the last non-leader member of the thread
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* group, and the leader is zombie, then notify the
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* group leader's parent process. (if it wants notification.)
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*/
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zap_leader = 0;
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leader = p->group_leader;
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if (leader != p && thread_group_empty(leader)
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&& leader->exit_state == EXIT_ZOMBIE) {
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/*
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* If we were the last child thread and the leader has
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* exited already, and the leader's parent ignores SIGCHLD,
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* then we are the one who should release the leader.
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*/
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zap_leader = do_notify_parent(leader, leader->exit_signal);
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if (zap_leader)
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leader->exit_state = EXIT_DEAD;
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}
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write_unlock_irq(&tasklist_lock);
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release_thread(p);
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put_task_struct_rcu_user(p);
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p = leader;
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if (unlikely(zap_leader))
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goto repeat;
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}
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/*
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* Note that if this function returns a valid task_struct pointer (!NULL)
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* task->usage must remain >0 for the duration of the RCU critical section.
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*/
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struct task_struct *task_rcu_dereference(struct task_struct **ptask)
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{
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struct sighand_struct *sighand;
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struct task_struct *task;
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/*
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* We need to verify that release_task() was not called and thus
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* delayed_put_task_struct() can't run and drop the last reference
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* before rcu_read_unlock(). We check task->sighand != NULL,
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* but we can read the already freed and reused memory.
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*/
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retry:
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task = rcu_dereference(*ptask);
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if (!task)
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return NULL;
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probe_kernel_address(&task->sighand, sighand);
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/*
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* Pairs with atomic_dec_and_test() in put_task_struct(). If this task
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* was already freed we can not miss the preceding update of this
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* pointer.
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*/
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smp_rmb();
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if (unlikely(task != READ_ONCE(*ptask)))
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goto retry;
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/*
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* We've re-checked that "task == *ptask", now we have two different
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* cases:
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*
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* 1. This is actually the same task/task_struct. In this case
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* sighand != NULL tells us it is still alive.
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*
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* 2. This is another task which got the same memory for task_struct.
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* We can't know this of course, and we can not trust
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* sighand != NULL.
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*
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* In this case we actually return a random value, but this is
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* correct.
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*
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* If we return NULL - we can pretend that we actually noticed that
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* *ptask was updated when the previous task has exited. Or pretend
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* that probe_slab_address(&sighand) reads NULL.
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*
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* If we return the new task (because sighand is not NULL for any
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* reason) - this is fine too. This (new) task can't go away before
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* another gp pass.
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*
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* And note: We could even eliminate the false positive if re-read
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* task->sighand once again to avoid the falsely NULL. But this case
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* is very unlikely so we don't care.
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*/
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if (!sighand)
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return NULL;
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return task;
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}
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void rcuwait_wake_up(struct rcuwait *w)
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{
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struct task_struct *task;
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rcu_read_lock();
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/*
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* Order condition vs @task, such that everything prior to the load
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* of @task is visible. This is the condition as to why the user called
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* rcuwait_trywake() in the first place. Pairs with set_current_state()
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* barrier (A) in rcuwait_wait_event().
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*
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* WAIT WAKE
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* [S] tsk = current [S] cond = true
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* MB (A) MB (B)
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* [L] cond [L] tsk
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*/
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smp_mb(); /* (B) */
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/*
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* Avoid using task_rcu_dereference() magic as long as we are careful,
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* see comment in rcuwait_wait_event() regarding ->exit_state.
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*/
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task = rcu_dereference(w->task);
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if (task)
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wake_up_process(task);
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rcu_read_unlock();
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}
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/*
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* Determine if a process group is "orphaned", according to the POSIX
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* definition in 2.2.2.52. Orphaned process groups are not to be affected
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* by terminal-generated stop signals. Newly orphaned process groups are
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* to receive a SIGHUP and a SIGCONT.
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*
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* "I ask you, have you ever known what it is to be an orphan?"
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*/
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static int will_become_orphaned_pgrp(struct pid *pgrp,
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struct task_struct *ignored_task)
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{
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struct task_struct *p;
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do_each_pid_task(pgrp, PIDTYPE_PGID, p) {
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if ((p == ignored_task) ||
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(p->exit_state && thread_group_empty(p)) ||
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is_global_init(p->real_parent))
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continue;
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if (task_pgrp(p->real_parent) != pgrp &&
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task_session(p->real_parent) == task_session(p))
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return 0;
|
|
} while_each_pid_task(pgrp, PIDTYPE_PGID, p);
|
|
|
|
return 1;
|
|
}
|
|
|
|
int is_current_pgrp_orphaned(void)
|
|
{
|
|
int retval;
|
|
|
|
read_lock(&tasklist_lock);
|
|
retval = will_become_orphaned_pgrp(task_pgrp(current), NULL);
|
|
read_unlock(&tasklist_lock);
|
|
|
|
return retval;
|
|
}
|
|
|
|
static bool has_stopped_jobs(struct pid *pgrp)
|
|
{
|
|
struct task_struct *p;
|
|
|
|
do_each_pid_task(pgrp, PIDTYPE_PGID, p) {
|
|
if (p->signal->flags & SIGNAL_STOP_STOPPED)
|
|
return true;
|
|
} while_each_pid_task(pgrp, PIDTYPE_PGID, p);
|
|
|
|
return false;
|
|
}
|
|
|
|
/*
|
|
* Check to see if any process groups have become orphaned as
|
|
* a result of our exiting, and if they have any stopped jobs,
|
|
* send them a SIGHUP and then a SIGCONT. (POSIX 3.2.2.2)
|
|
*/
|
|
static void
|
|
kill_orphaned_pgrp(struct task_struct *tsk, struct task_struct *parent)
|
|
{
|
|
struct pid *pgrp = task_pgrp(tsk);
|
|
struct task_struct *ignored_task = tsk;
|
|
|
|
if (!parent)
|
|
/* exit: our father is in a different pgrp than
|
|
* we are and we were the only connection outside.
|
|
*/
|
|
parent = tsk->real_parent;
|
|
else
|
|
/* reparent: our child is in a different pgrp than
|
|
* we are, and it was the only connection outside.
|
|
*/
|
|
ignored_task = NULL;
|
|
|
|
if (task_pgrp(parent) != pgrp &&
|
|
task_session(parent) == task_session(tsk) &&
|
|
will_become_orphaned_pgrp(pgrp, ignored_task) &&
|
|
has_stopped_jobs(pgrp)) {
|
|
__kill_pgrp_info(SIGHUP, SEND_SIG_PRIV, pgrp);
|
|
__kill_pgrp_info(SIGCONT, SEND_SIG_PRIV, pgrp);
|
|
}
|
|
}
|
|
|
|
#ifdef CONFIG_MEMCG
|
|
/*
|
|
* A task is exiting. If it owned this mm, find a new owner for the mm.
|
|
*/
|
|
void mm_update_next_owner(struct mm_struct *mm)
|
|
{
|
|
struct task_struct *c, *g, *p = current;
|
|
|
|
retry:
|
|
/*
|
|
* If the exiting or execing task is not the owner, it's
|
|
* someone else's problem.
|
|
*/
|
|
if (mm->owner != p)
|
|
return;
|
|
/*
|
|
* The current owner is exiting/execing and there are no other
|
|
* candidates. Do not leave the mm pointing to a possibly
|
|
* freed task structure.
|
|
*/
|
|
if (atomic_read(&mm->mm_users) <= 1) {
|
|
mm->owner = NULL;
|
|
return;
|
|
}
|
|
|
|
read_lock(&tasklist_lock);
|
|
/*
|
|
* Search in the children
|
|
*/
|
|
list_for_each_entry(c, &p->children, sibling) {
|
|
if (c->mm == mm)
|
|
goto assign_new_owner;
|
|
}
|
|
|
|
/*
|
|
* Search in the siblings
|
|
*/
|
|
list_for_each_entry(c, &p->real_parent->children, sibling) {
|
|
if (c->mm == mm)
|
|
goto assign_new_owner;
|
|
}
|
|
|
|
/*
|
|
* Search through everything else, we should not get here often.
|
|
*/
|
|
for_each_process(g) {
|
|
if (g->flags & PF_KTHREAD)
|
|
continue;
|
|
for_each_thread(g, c) {
|
|
if (c->mm == mm)
|
|
goto assign_new_owner;
|
|
if (c->mm)
|
|
break;
|
|
}
|
|
}
|
|
read_unlock(&tasklist_lock);
|
|
/*
|
|
* We found no owner yet mm_users > 1: this implies that we are
|
|
* most likely racing with swapoff (try_to_unuse()) or /proc or
|
|
* ptrace or page migration (get_task_mm()). Mark owner as NULL.
|
|
*/
|
|
mm->owner = NULL;
|
|
return;
|
|
|
|
assign_new_owner:
|
|
BUG_ON(c == p);
|
|
get_task_struct(c);
|
|
/*
|
|
* The task_lock protects c->mm from changing.
|
|
* We always want mm->owner->mm == mm
|
|
*/
|
|
task_lock(c);
|
|
/*
|
|
* Delay read_unlock() till we have the task_lock()
|
|
* to ensure that c does not slip away underneath us
|
|
*/
|
|
read_unlock(&tasklist_lock);
|
|
if (c->mm != mm) {
|
|
task_unlock(c);
|
|
put_task_struct(c);
|
|
goto retry;
|
|
}
|
|
mm->owner = c;
|
|
task_unlock(c);
|
|
put_task_struct(c);
|
|
}
|
|
#endif /* CONFIG_MEMCG */
|
|
|
|
/*
|
|
* Turn us into a lazy TLB process if we
|
|
* aren't already..
|
|
*/
|
|
static void exit_mm(void)
|
|
{
|
|
struct mm_struct *mm = current->mm;
|
|
struct core_state *core_state;
|
|
|
|
exit_mm_release(current, mm);
|
|
if (!mm)
|
|
return;
|
|
sync_mm_rss(mm);
|
|
/*
|
|
* Serialize with any possible pending coredump.
|
|
* We must hold mmap_sem around checking core_state
|
|
* and clearing tsk->mm. The core-inducing thread
|
|
* will increment ->nr_threads for each thread in the
|
|
* group with ->mm != NULL.
|
|
*/
|
|
down_read(&mm->mmap_sem);
|
|
core_state = mm->core_state;
|
|
if (core_state) {
|
|
struct core_thread self;
|
|
|
|
up_read(&mm->mmap_sem);
|
|
|
|
self.task = current;
|
|
if (self.task->flags & PF_SIGNALED)
|
|
self.next = xchg(&core_state->dumper.next, &self);
|
|
else
|
|
self.task = NULL;
|
|
/*
|
|
* Implies mb(), the result of xchg() must be visible
|
|
* to core_state->dumper.
|
|
*/
|
|
if (atomic_dec_and_test(&core_state->nr_threads))
|
|
complete(&core_state->startup);
|
|
|
|
for (;;) {
|
|
set_current_state(TASK_UNINTERRUPTIBLE);
|
|
if (!self.task) /* see coredump_finish() */
|
|
break;
|
|
freezable_schedule();
|
|
}
|
|
__set_current_state(TASK_RUNNING);
|
|
down_read(&mm->mmap_sem);
|
|
}
|
|
mmgrab(mm);
|
|
BUG_ON(mm != current->active_mm);
|
|
/* more a memory barrier than a real lock */
|
|
task_lock(current);
|
|
current->mm = NULL;
|
|
up_read(&mm->mmap_sem);
|
|
enter_lazy_tlb(mm, current);
|
|
task_unlock(current);
|
|
mm_update_next_owner(mm);
|
|
mmput(mm);
|
|
if (test_thread_flag(TIF_MEMDIE))
|
|
exit_oom_victim();
|
|
}
|
|
|
|
static struct task_struct *find_alive_thread(struct task_struct *p)
|
|
{
|
|
struct task_struct *t;
|
|
|
|
for_each_thread(p, t) {
|
|
if (!(t->flags & PF_EXITING))
|
|
return t;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static struct task_struct *find_child_reaper(struct task_struct *father,
|
|
struct list_head *dead)
|
|
__releases(&tasklist_lock)
|
|
__acquires(&tasklist_lock)
|
|
{
|
|
struct pid_namespace *pid_ns = task_active_pid_ns(father);
|
|
struct task_struct *reaper = pid_ns->child_reaper;
|
|
struct task_struct *p, *n;
|
|
|
|
if (likely(reaper != father))
|
|
return reaper;
|
|
|
|
reaper = find_alive_thread(father);
|
|
if (reaper) {
|
|
pid_ns->child_reaper = reaper;
|
|
return reaper;
|
|
}
|
|
|
|
write_unlock_irq(&tasklist_lock);
|
|
|
|
list_for_each_entry_safe(p, n, dead, ptrace_entry) {
|
|
list_del_init(&p->ptrace_entry);
|
|
release_task(p);
|
|
}
|
|
|
|
zap_pid_ns_processes(pid_ns);
|
|
write_lock_irq(&tasklist_lock);
|
|
|
|
return father;
|
|
}
|
|
|
|
/*
|
|
* When we die, we re-parent all our children, and try to:
|
|
* 1. give them to another thread in our thread group, if such a member exists
|
|
* 2. give it to the first ancestor process which prctl'd itself as a
|
|
* child_subreaper for its children (like a service manager)
|
|
* 3. give it to the init process (PID 1) in our pid namespace
|
|
*/
|
|
static struct task_struct *find_new_reaper(struct task_struct *father,
|
|
struct task_struct *child_reaper)
|
|
{
|
|
struct task_struct *thread, *reaper;
|
|
|
|
thread = find_alive_thread(father);
|
|
if (thread)
|
|
return thread;
|
|
|
|
if (father->signal->has_child_subreaper) {
|
|
unsigned int ns_level = task_pid(father)->level;
|
|
/*
|
|
* Find the first ->is_child_subreaper ancestor in our pid_ns.
|
|
* We can't check reaper != child_reaper to ensure we do not
|
|
* cross the namespaces, the exiting parent could be injected
|
|
* by setns() + fork().
|
|
* We check pid->level, this is slightly more efficient than
|
|
* task_active_pid_ns(reaper) != task_active_pid_ns(father).
|
|
*/
|
|
for (reaper = father->real_parent;
|
|
task_pid(reaper)->level == ns_level;
|
|
reaper = reaper->real_parent) {
|
|
if (reaper == &init_task)
|
|
break;
|
|
if (!reaper->signal->is_child_subreaper)
|
|
continue;
|
|
thread = find_alive_thread(reaper);
|
|
if (thread)
|
|
return thread;
|
|
}
|
|
}
|
|
|
|
return child_reaper;
|
|
}
|
|
|
|
/*
|
|
* Any that need to be release_task'd are put on the @dead list.
|
|
*/
|
|
static void reparent_leader(struct task_struct *father, struct task_struct *p,
|
|
struct list_head *dead)
|
|
{
|
|
if (unlikely(p->exit_state == EXIT_DEAD))
|
|
return;
|
|
|
|
/* We don't want people slaying init. */
|
|
p->exit_signal = SIGCHLD;
|
|
|
|
/* If it has exited notify the new parent about this child's death. */
|
|
if (!p->ptrace &&
|
|
p->exit_state == EXIT_ZOMBIE && thread_group_empty(p)) {
|
|
if (do_notify_parent(p, p->exit_signal)) {
|
|
p->exit_state = EXIT_DEAD;
|
|
list_add(&p->ptrace_entry, dead);
|
|
}
|
|
}
|
|
|
|
kill_orphaned_pgrp(p, father);
|
|
}
|
|
|
|
/*
|
|
* This does two things:
|
|
*
|
|
* A. Make init inherit all the child processes
|
|
* B. Check to see if any process groups have become orphaned
|
|
* as a result of our exiting, and if they have any stopped
|
|
* jobs, send them a SIGHUP and then a SIGCONT. (POSIX 3.2.2.2)
|
|
*/
|
|
static void forget_original_parent(struct task_struct *father,
|
|
struct list_head *dead)
|
|
{
|
|
struct task_struct *p, *t, *reaper;
|
|
|
|
if (unlikely(!list_empty(&father->ptraced)))
|
|
exit_ptrace(father, dead);
|
|
|
|
/* Can drop and reacquire tasklist_lock */
|
|
reaper = find_child_reaper(father, dead);
|
|
if (list_empty(&father->children))
|
|
return;
|
|
|
|
reaper = find_new_reaper(father, reaper);
|
|
list_for_each_entry(p, &father->children, sibling) {
|
|
for_each_thread(p, t) {
|
|
t->real_parent = reaper;
|
|
BUG_ON((!t->ptrace) != (t->parent == father));
|
|
if (likely(!t->ptrace))
|
|
t->parent = t->real_parent;
|
|
if (t->pdeath_signal)
|
|
group_send_sig_info(t->pdeath_signal,
|
|
SEND_SIG_NOINFO, t,
|
|
PIDTYPE_TGID);
|
|
}
|
|
/*
|
|
* If this is a threaded reparent there is no need to
|
|
* notify anyone anything has happened.
|
|
*/
|
|
if (!same_thread_group(reaper, father))
|
|
reparent_leader(father, p, dead);
|
|
}
|
|
list_splice_tail_init(&father->children, &reaper->children);
|
|
}
|
|
|
|
/*
|
|
* Send signals to all our closest relatives so that they know
|
|
* to properly mourn us..
|
|
*/
|
|
static void exit_notify(struct task_struct *tsk, int group_dead)
|
|
{
|
|
bool autoreap;
|
|
struct task_struct *p, *n;
|
|
LIST_HEAD(dead);
|
|
|
|
write_lock_irq(&tasklist_lock);
|
|
forget_original_parent(tsk, &dead);
|
|
|
|
if (group_dead)
|
|
kill_orphaned_pgrp(tsk->group_leader, NULL);
|
|
|
|
tsk->exit_state = EXIT_ZOMBIE;
|
|
if (unlikely(tsk->ptrace)) {
|
|
int sig = thread_group_leader(tsk) &&
|
|
thread_group_empty(tsk) &&
|
|
!ptrace_reparented(tsk) ?
|
|
tsk->exit_signal : SIGCHLD;
|
|
autoreap = do_notify_parent(tsk, sig);
|
|
} else if (thread_group_leader(tsk)) {
|
|
autoreap = thread_group_empty(tsk) &&
|
|
do_notify_parent(tsk, tsk->exit_signal);
|
|
} else {
|
|
autoreap = true;
|
|
}
|
|
|
|
tsk->exit_state = autoreap ? EXIT_DEAD : EXIT_ZOMBIE;
|
|
if (tsk->exit_state == EXIT_DEAD)
|
|
list_add(&tsk->ptrace_entry, &dead);
|
|
|
|
/* mt-exec, de_thread() is waiting for group leader */
|
|
if (unlikely(tsk->signal->notify_count < 0))
|
|
wake_up_process(tsk->signal->group_exit_task);
|
|
write_unlock_irq(&tasklist_lock);
|
|
|
|
list_for_each_entry_safe(p, n, &dead, ptrace_entry) {
|
|
list_del_init(&p->ptrace_entry);
|
|
release_task(p);
|
|
}
|
|
}
|
|
|
|
#ifdef CONFIG_DEBUG_STACK_USAGE
|
|
static void check_stack_usage(void)
|
|
{
|
|
static DEFINE_SPINLOCK(low_water_lock);
|
|
static int lowest_to_date = THREAD_SIZE;
|
|
unsigned long free;
|
|
|
|
free = stack_not_used(current);
|
|
|
|
if (free >= lowest_to_date)
|
|
return;
|
|
|
|
spin_lock(&low_water_lock);
|
|
if (free < lowest_to_date) {
|
|
pr_info("%s (%d) used greatest stack depth: %lu bytes left\n",
|
|
current->comm, task_pid_nr(current), free);
|
|
lowest_to_date = free;
|
|
}
|
|
spin_unlock(&low_water_lock);
|
|
}
|
|
#else
|
|
static inline void check_stack_usage(void) {}
|
|
#endif
|
|
|
|
void __noreturn do_exit(long code)
|
|
{
|
|
struct task_struct *tsk = current;
|
|
int group_dead;
|
|
|
|
/*
|
|
* We can get here from a kernel oops, sometimes with preemption off.
|
|
* Start by checking for critical errors.
|
|
* Then fix up important state like USER_DS and preemption.
|
|
* Then do everything else.
|
|
*/
|
|
|
|
WARN_ON(blk_needs_flush_plug(tsk));
|
|
|
|
if (unlikely(in_interrupt()))
|
|
panic("Aiee, killing interrupt handler!");
|
|
if (unlikely(!tsk->pid))
|
|
panic("Attempted to kill the idle task!");
|
|
|
|
/*
|
|
* If do_exit is called because this processes oopsed, it's possible
|
|
* that get_fs() was left as KERNEL_DS, so reset it to USER_DS before
|
|
* continuing. Amongst other possible reasons, this is to prevent
|
|
* mm_release()->clear_child_tid() from writing to a user-controlled
|
|
* kernel address.
|
|
*/
|
|
set_fs(USER_DS);
|
|
|
|
if (unlikely(in_atomic())) {
|
|
pr_info("note: %s[%d] exited with preempt_count %d\n",
|
|
current->comm, task_pid_nr(current),
|
|
preempt_count());
|
|
preempt_count_set(PREEMPT_ENABLED);
|
|
}
|
|
|
|
profile_task_exit(tsk);
|
|
kcov_task_exit(tsk);
|
|
|
|
ptrace_event(PTRACE_EVENT_EXIT, code);
|
|
|
|
validate_creds_for_do_exit(tsk);
|
|
|
|
/*
|
|
* We're taking recursive faults here in do_exit. Safest is to just
|
|
* leave this task alone and wait for reboot.
|
|
*/
|
|
if (unlikely(tsk->flags & PF_EXITING)) {
|
|
pr_alert("Fixing recursive fault but reboot is needed!\n");
|
|
futex_exit_recursive(tsk);
|
|
set_current_state(TASK_UNINTERRUPTIBLE);
|
|
schedule();
|
|
}
|
|
|
|
exit_signals(tsk); /* sets PF_EXITING */
|
|
sched_exit(tsk);
|
|
|
|
/* sync mm's RSS info before statistics gathering */
|
|
if (tsk->mm)
|
|
sync_mm_rss(tsk->mm);
|
|
acct_update_integrals(tsk);
|
|
group_dead = atomic_dec_and_test(&tsk->signal->live);
|
|
if (group_dead) {
|
|
/*
|
|
* If the last thread of global init has exited, panic
|
|
* immediately to get a useable coredump.
|
|
*/
|
|
if (unlikely(is_global_init(tsk)))
|
|
panic("Attempted to kill init! exitcode=0x%08x\n",
|
|
tsk->signal->group_exit_code ?: (int)code);
|
|
|
|
#ifdef CONFIG_POSIX_TIMERS
|
|
hrtimer_cancel(&tsk->signal->real_timer);
|
|
exit_itimers(tsk->signal);
|
|
#endif
|
|
if (tsk->mm)
|
|
setmax_mm_hiwater_rss(&tsk->signal->maxrss, tsk->mm);
|
|
}
|
|
acct_collect(code, group_dead);
|
|
if (group_dead)
|
|
tty_audit_exit();
|
|
audit_free(tsk);
|
|
|
|
tsk->exit_code = code;
|
|
taskstats_exit(tsk, group_dead);
|
|
|
|
exit_mm();
|
|
|
|
if (group_dead)
|
|
acct_process();
|
|
trace_sched_process_exit(tsk);
|
|
|
|
exit_sem(tsk);
|
|
exit_shm(tsk);
|
|
exit_files(tsk);
|
|
exit_fs(tsk);
|
|
if (group_dead)
|
|
disassociate_ctty(1);
|
|
exit_task_namespaces(tsk);
|
|
exit_task_work(tsk);
|
|
exit_thread(tsk);
|
|
|
|
/*
|
|
* Flush inherited counters to the parent - before the parent
|
|
* gets woken up by child-exit notifications.
|
|
*
|
|
* because of cgroup mode, must be called before cgroup_exit()
|
|
*/
|
|
perf_event_exit_task(tsk);
|
|
|
|
sched_autogroup_exit_task(tsk);
|
|
cgroup_exit(tsk);
|
|
|
|
/*
|
|
* FIXME: do that only when needed, using sched_exit tracepoint
|
|
*/
|
|
flush_ptrace_hw_breakpoint(tsk);
|
|
|
|
exit_tasks_rcu_start();
|
|
exit_notify(tsk, group_dead);
|
|
proc_exit_connector(tsk);
|
|
mpol_put_task_policy(tsk);
|
|
#ifdef CONFIG_FUTEX
|
|
if (unlikely(current->pi_state_cache))
|
|
kfree(current->pi_state_cache);
|
|
#endif
|
|
/*
|
|
* Make sure we are holding no locks:
|
|
*/
|
|
debug_check_no_locks_held();
|
|
|
|
if (tsk->io_context)
|
|
exit_io_context(tsk);
|
|
|
|
if (tsk->splice_pipe)
|
|
free_pipe_info(tsk->splice_pipe);
|
|
|
|
if (tsk->task_frag.page)
|
|
put_page(tsk->task_frag.page);
|
|
|
|
validate_creds_for_do_exit(tsk);
|
|
|
|
check_stack_usage();
|
|
preempt_disable();
|
|
if (tsk->nr_dirtied)
|
|
__this_cpu_add(dirty_throttle_leaks, tsk->nr_dirtied);
|
|
exit_rcu();
|
|
exit_tasks_rcu_finish();
|
|
|
|
lockdep_free_task(tsk);
|
|
do_task_dead();
|
|
}
|
|
EXPORT_SYMBOL_GPL(do_exit);
|
|
|
|
void __noreturn make_task_dead(int signr)
|
|
{
|
|
/*
|
|
* Take the task off the cpu after something catastrophic has
|
|
* happened.
|
|
*/
|
|
unsigned int limit;
|
|
|
|
/*
|
|
* Every time the system oopses, if the oops happens while a reference
|
|
* to an object was held, the reference leaks.
|
|
* If the oops doesn't also leak memory, repeated oopsing can cause
|
|
* reference counters to wrap around (if they're not using refcount_t).
|
|
* This means that repeated oopsing can make unexploitable-looking bugs
|
|
* exploitable through repeated oopsing.
|
|
* To make sure this can't happen, place an upper bound on how often the
|
|
* kernel may oops without panic().
|
|
*/
|
|
limit = READ_ONCE(oops_limit);
|
|
if (atomic_inc_return(&oops_count) >= limit && limit)
|
|
panic("Oopsed too often (kernel.oops_limit is %d)", limit);
|
|
|
|
do_exit(signr);
|
|
}
|
|
|
|
void complete_and_exit(struct completion *comp, long code)
|
|
{
|
|
if (comp)
|
|
complete(comp);
|
|
|
|
do_exit(code);
|
|
}
|
|
EXPORT_SYMBOL(complete_and_exit);
|
|
|
|
SYSCALL_DEFINE1(exit, int, error_code)
|
|
{
|
|
do_exit((error_code&0xff)<<8);
|
|
}
|
|
|
|
/*
|
|
* Take down every thread in the group. This is called by fatal signals
|
|
* as well as by sys_exit_group (below).
|
|
*/
|
|
void
|
|
do_group_exit(int exit_code)
|
|
{
|
|
struct signal_struct *sig = current->signal;
|
|
|
|
BUG_ON(exit_code & 0x80); /* core dumps don't get here */
|
|
|
|
if (signal_group_exit(sig))
|
|
exit_code = sig->group_exit_code;
|
|
else if (!thread_group_empty(current)) {
|
|
struct sighand_struct *const sighand = current->sighand;
|
|
|
|
spin_lock_irq(&sighand->siglock);
|
|
if (signal_group_exit(sig))
|
|
/* Another thread got here before we took the lock. */
|
|
exit_code = sig->group_exit_code;
|
|
else {
|
|
sig->group_exit_code = exit_code;
|
|
sig->flags = SIGNAL_GROUP_EXIT;
|
|
zap_other_threads(current);
|
|
}
|
|
spin_unlock_irq(&sighand->siglock);
|
|
}
|
|
|
|
do_exit(exit_code);
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
/*
|
|
* this kills every thread in the thread group. Note that any externally
|
|
* wait4()-ing process will get the correct exit code - even if this
|
|
* thread is not the thread group leader.
|
|
*/
|
|
SYSCALL_DEFINE1(exit_group, int, error_code)
|
|
{
|
|
do_group_exit((error_code & 0xff) << 8);
|
|
/* NOTREACHED */
|
|
return 0;
|
|
}
|
|
|
|
struct waitid_info {
|
|
pid_t pid;
|
|
uid_t uid;
|
|
int status;
|
|
int cause;
|
|
};
|
|
|
|
struct wait_opts {
|
|
enum pid_type wo_type;
|
|
int wo_flags;
|
|
struct pid *wo_pid;
|
|
|
|
struct waitid_info *wo_info;
|
|
int wo_stat;
|
|
struct rusage *wo_rusage;
|
|
|
|
wait_queue_entry_t child_wait;
|
|
int notask_error;
|
|
};
|
|
|
|
static int eligible_pid(struct wait_opts *wo, struct task_struct *p)
|
|
{
|
|
return wo->wo_type == PIDTYPE_MAX ||
|
|
task_pid_type(p, wo->wo_type) == wo->wo_pid;
|
|
}
|
|
|
|
static int
|
|
eligible_child(struct wait_opts *wo, bool ptrace, struct task_struct *p)
|
|
{
|
|
if (!eligible_pid(wo, p))
|
|
return 0;
|
|
|
|
/*
|
|
* Wait for all children (clone and not) if __WALL is set or
|
|
* if it is traced by us.
|
|
*/
|
|
if (ptrace || (wo->wo_flags & __WALL))
|
|
return 1;
|
|
|
|
/*
|
|
* Otherwise, wait for clone children *only* if __WCLONE is set;
|
|
* otherwise, wait for non-clone children *only*.
|
|
*
|
|
* Note: a "clone" child here is one that reports to its parent
|
|
* using a signal other than SIGCHLD, or a non-leader thread which
|
|
* we can only see if it is traced by us.
|
|
*/
|
|
if ((p->exit_signal != SIGCHLD) ^ !!(wo->wo_flags & __WCLONE))
|
|
return 0;
|
|
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* Handle sys_wait4 work for one task in state EXIT_ZOMBIE. We hold
|
|
* read_lock(&tasklist_lock) on entry. If we return zero, we still hold
|
|
* the lock and this task is uninteresting. If we return nonzero, we have
|
|
* released the lock and the system call should return.
|
|
*/
|
|
static int wait_task_zombie(struct wait_opts *wo, struct task_struct *p)
|
|
{
|
|
int state, status;
|
|
pid_t pid = task_pid_vnr(p);
|
|
uid_t uid = from_kuid_munged(current_user_ns(), task_uid(p));
|
|
struct waitid_info *infop;
|
|
|
|
if (!likely(wo->wo_flags & WEXITED))
|
|
return 0;
|
|
|
|
if (unlikely(wo->wo_flags & WNOWAIT)) {
|
|
status = p->exit_code;
|
|
get_task_struct(p);
|
|
read_unlock(&tasklist_lock);
|
|
sched_annotate_sleep();
|
|
if (wo->wo_rusage)
|
|
getrusage(p, RUSAGE_BOTH, wo->wo_rusage);
|
|
put_task_struct(p);
|
|
goto out_info;
|
|
}
|
|
/*
|
|
* Move the task's state to DEAD/TRACE, only one thread can do this.
|
|
*/
|
|
state = (ptrace_reparented(p) && thread_group_leader(p)) ?
|
|
EXIT_TRACE : EXIT_DEAD;
|
|
if (cmpxchg(&p->exit_state, EXIT_ZOMBIE, state) != EXIT_ZOMBIE)
|
|
return 0;
|
|
/*
|
|
* We own this thread, nobody else can reap it.
|
|
*/
|
|
read_unlock(&tasklist_lock);
|
|
sched_annotate_sleep();
|
|
|
|
/*
|
|
* Check thread_group_leader() to exclude the traced sub-threads.
|
|
*/
|
|
if (state == EXIT_DEAD && thread_group_leader(p)) {
|
|
struct signal_struct *sig = p->signal;
|
|
struct signal_struct *psig = current->signal;
|
|
unsigned long maxrss;
|
|
u64 tgutime, tgstime;
|
|
|
|
/*
|
|
* The resource counters for the group leader are in its
|
|
* own task_struct. Those for dead threads in the group
|
|
* are in its signal_struct, as are those for the child
|
|
* processes it has previously reaped. All these
|
|
* accumulate in the parent's signal_struct c* fields.
|
|
*
|
|
* We don't bother to take a lock here to protect these
|
|
* p->signal fields because the whole thread group is dead
|
|
* and nobody can change them.
|
|
*
|
|
* psig->stats_lock also protects us from our sub-theads
|
|
* which can reap other children at the same time. Until
|
|
* we change k_getrusage()-like users to rely on this lock
|
|
* we have to take ->siglock as well.
|
|
*
|
|
* We use thread_group_cputime_adjusted() to get times for
|
|
* the thread group, which consolidates times for all threads
|
|
* in the group including the group leader.
|
|
*/
|
|
thread_group_cputime_adjusted(p, &tgutime, &tgstime);
|
|
spin_lock_irq(¤t->sighand->siglock);
|
|
write_seqlock(&psig->stats_lock);
|
|
psig->cutime += tgutime + sig->cutime;
|
|
psig->cstime += tgstime + sig->cstime;
|
|
psig->cgtime += task_gtime(p) + sig->gtime + sig->cgtime;
|
|
psig->cmin_flt +=
|
|
p->min_flt + sig->min_flt + sig->cmin_flt;
|
|
psig->cmaj_flt +=
|
|
p->maj_flt + sig->maj_flt + sig->cmaj_flt;
|
|
psig->cnvcsw +=
|
|
p->nvcsw + sig->nvcsw + sig->cnvcsw;
|
|
psig->cnivcsw +=
|
|
p->nivcsw + sig->nivcsw + sig->cnivcsw;
|
|
psig->cinblock +=
|
|
task_io_get_inblock(p) +
|
|
sig->inblock + sig->cinblock;
|
|
psig->coublock +=
|
|
task_io_get_oublock(p) +
|
|
sig->oublock + sig->coublock;
|
|
maxrss = max(sig->maxrss, sig->cmaxrss);
|
|
if (psig->cmaxrss < maxrss)
|
|
psig->cmaxrss = maxrss;
|
|
task_io_accounting_add(&psig->ioac, &p->ioac);
|
|
task_io_accounting_add(&psig->ioac, &sig->ioac);
|
|
write_sequnlock(&psig->stats_lock);
|
|
spin_unlock_irq(¤t->sighand->siglock);
|
|
}
|
|
|
|
if (wo->wo_rusage)
|
|
getrusage(p, RUSAGE_BOTH, wo->wo_rusage);
|
|
status = (p->signal->flags & SIGNAL_GROUP_EXIT)
|
|
? p->signal->group_exit_code : p->exit_code;
|
|
wo->wo_stat = status;
|
|
|
|
if (state == EXIT_TRACE) {
|
|
write_lock_irq(&tasklist_lock);
|
|
/* We dropped tasklist, ptracer could die and untrace */
|
|
ptrace_unlink(p);
|
|
|
|
/* If parent wants a zombie, don't release it now */
|
|
state = EXIT_ZOMBIE;
|
|
if (do_notify_parent(p, p->exit_signal))
|
|
state = EXIT_DEAD;
|
|
p->exit_state = state;
|
|
write_unlock_irq(&tasklist_lock);
|
|
}
|
|
if (state == EXIT_DEAD)
|
|
release_task(p);
|
|
|
|
out_info:
|
|
infop = wo->wo_info;
|
|
if (infop) {
|
|
if ((status & 0x7f) == 0) {
|
|
infop->cause = CLD_EXITED;
|
|
infop->status = status >> 8;
|
|
} else {
|
|
infop->cause = (status & 0x80) ? CLD_DUMPED : CLD_KILLED;
|
|
infop->status = status & 0x7f;
|
|
}
|
|
infop->pid = pid;
|
|
infop->uid = uid;
|
|
}
|
|
|
|
return pid;
|
|
}
|
|
|
|
static int *task_stopped_code(struct task_struct *p, bool ptrace)
|
|
{
|
|
if (ptrace) {
|
|
if (task_is_traced(p) && !(p->jobctl & JOBCTL_LISTENING))
|
|
return &p->exit_code;
|
|
} else {
|
|
if (p->signal->flags & SIGNAL_STOP_STOPPED)
|
|
return &p->signal->group_exit_code;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* wait_task_stopped - Wait for %TASK_STOPPED or %TASK_TRACED
|
|
* @wo: wait options
|
|
* @ptrace: is the wait for ptrace
|
|
* @p: task to wait for
|
|
*
|
|
* Handle sys_wait4() work for %p in state %TASK_STOPPED or %TASK_TRACED.
|
|
*
|
|
* CONTEXT:
|
|
* read_lock(&tasklist_lock), which is released if return value is
|
|
* non-zero. Also, grabs and releases @p->sighand->siglock.
|
|
*
|
|
* RETURNS:
|
|
* 0 if wait condition didn't exist and search for other wait conditions
|
|
* should continue. Non-zero return, -errno on failure and @p's pid on
|
|
* success, implies that tasklist_lock is released and wait condition
|
|
* search should terminate.
|
|
*/
|
|
static int wait_task_stopped(struct wait_opts *wo,
|
|
int ptrace, struct task_struct *p)
|
|
{
|
|
struct waitid_info *infop;
|
|
int exit_code, *p_code, why;
|
|
uid_t uid = 0; /* unneeded, required by compiler */
|
|
pid_t pid;
|
|
|
|
/*
|
|
* Traditionally we see ptrace'd stopped tasks regardless of options.
|
|
*/
|
|
if (!ptrace && !(wo->wo_flags & WUNTRACED))
|
|
return 0;
|
|
|
|
if (!task_stopped_code(p, ptrace))
|
|
return 0;
|
|
|
|
exit_code = 0;
|
|
spin_lock_irq(&p->sighand->siglock);
|
|
|
|
p_code = task_stopped_code(p, ptrace);
|
|
if (unlikely(!p_code))
|
|
goto unlock_sig;
|
|
|
|
exit_code = *p_code;
|
|
if (!exit_code)
|
|
goto unlock_sig;
|
|
|
|
if (!unlikely(wo->wo_flags & WNOWAIT))
|
|
*p_code = 0;
|
|
|
|
uid = from_kuid_munged(current_user_ns(), task_uid(p));
|
|
unlock_sig:
|
|
spin_unlock_irq(&p->sighand->siglock);
|
|
if (!exit_code)
|
|
return 0;
|
|
|
|
/*
|
|
* Now we are pretty sure this task is interesting.
|
|
* Make sure it doesn't get reaped out from under us while we
|
|
* give up the lock and then examine it below. We don't want to
|
|
* keep holding onto the tasklist_lock while we call getrusage and
|
|
* possibly take page faults for user memory.
|
|
*/
|
|
get_task_struct(p);
|
|
pid = task_pid_vnr(p);
|
|
why = ptrace ? CLD_TRAPPED : CLD_STOPPED;
|
|
read_unlock(&tasklist_lock);
|
|
sched_annotate_sleep();
|
|
if (wo->wo_rusage)
|
|
getrusage(p, RUSAGE_BOTH, wo->wo_rusage);
|
|
put_task_struct(p);
|
|
|
|
if (likely(!(wo->wo_flags & WNOWAIT)))
|
|
wo->wo_stat = (exit_code << 8) | 0x7f;
|
|
|
|
infop = wo->wo_info;
|
|
if (infop) {
|
|
infop->cause = why;
|
|
infop->status = exit_code;
|
|
infop->pid = pid;
|
|
infop->uid = uid;
|
|
}
|
|
return pid;
|
|
}
|
|
|
|
/*
|
|
* Handle do_wait work for one task in a live, non-stopped state.
|
|
* read_lock(&tasklist_lock) on entry. If we return zero, we still hold
|
|
* the lock and this task is uninteresting. If we return nonzero, we have
|
|
* released the lock and the system call should return.
|
|
*/
|
|
static int wait_task_continued(struct wait_opts *wo, struct task_struct *p)
|
|
{
|
|
struct waitid_info *infop;
|
|
pid_t pid;
|
|
uid_t uid;
|
|
|
|
if (!unlikely(wo->wo_flags & WCONTINUED))
|
|
return 0;
|
|
|
|
if (!(p->signal->flags & SIGNAL_STOP_CONTINUED))
|
|
return 0;
|
|
|
|
spin_lock_irq(&p->sighand->siglock);
|
|
/* Re-check with the lock held. */
|
|
if (!(p->signal->flags & SIGNAL_STOP_CONTINUED)) {
|
|
spin_unlock_irq(&p->sighand->siglock);
|
|
return 0;
|
|
}
|
|
if (!unlikely(wo->wo_flags & WNOWAIT))
|
|
p->signal->flags &= ~SIGNAL_STOP_CONTINUED;
|
|
uid = from_kuid_munged(current_user_ns(), task_uid(p));
|
|
spin_unlock_irq(&p->sighand->siglock);
|
|
|
|
pid = task_pid_vnr(p);
|
|
get_task_struct(p);
|
|
read_unlock(&tasklist_lock);
|
|
sched_annotate_sleep();
|
|
if (wo->wo_rusage)
|
|
getrusage(p, RUSAGE_BOTH, wo->wo_rusage);
|
|
put_task_struct(p);
|
|
|
|
infop = wo->wo_info;
|
|
if (!infop) {
|
|
wo->wo_stat = 0xffff;
|
|
} else {
|
|
infop->cause = CLD_CONTINUED;
|
|
infop->pid = pid;
|
|
infop->uid = uid;
|
|
infop->status = SIGCONT;
|
|
}
|
|
return pid;
|
|
}
|
|
|
|
/*
|
|
* Consider @p for a wait by @parent.
|
|
*
|
|
* -ECHILD should be in ->notask_error before the first call.
|
|
* Returns nonzero for a final return, when we have unlocked tasklist_lock.
|
|
* Returns zero if the search for a child should continue;
|
|
* then ->notask_error is 0 if @p is an eligible child,
|
|
* or still -ECHILD.
|
|
*/
|
|
static int wait_consider_task(struct wait_opts *wo, int ptrace,
|
|
struct task_struct *p)
|
|
{
|
|
/*
|
|
* We can race with wait_task_zombie() from another thread.
|
|
* Ensure that EXIT_ZOMBIE -> EXIT_DEAD/EXIT_TRACE transition
|
|
* can't confuse the checks below.
|
|
*/
|
|
int exit_state = READ_ONCE(p->exit_state);
|
|
int ret;
|
|
|
|
if (unlikely(exit_state == EXIT_DEAD))
|
|
return 0;
|
|
|
|
ret = eligible_child(wo, ptrace, p);
|
|
if (!ret)
|
|
return ret;
|
|
|
|
if (unlikely(exit_state == EXIT_TRACE)) {
|
|
/*
|
|
* ptrace == 0 means we are the natural parent. In this case
|
|
* we should clear notask_error, debugger will notify us.
|
|
*/
|
|
if (likely(!ptrace))
|
|
wo->notask_error = 0;
|
|
return 0;
|
|
}
|
|
|
|
if (likely(!ptrace) && unlikely(p->ptrace)) {
|
|
/*
|
|
* If it is traced by its real parent's group, just pretend
|
|
* the caller is ptrace_do_wait() and reap this child if it
|
|
* is zombie.
|
|
*
|
|
* This also hides group stop state from real parent; otherwise
|
|
* a single stop can be reported twice as group and ptrace stop.
|
|
* If a ptracer wants to distinguish these two events for its
|
|
* own children it should create a separate process which takes
|
|
* the role of real parent.
|
|
*/
|
|
if (!ptrace_reparented(p))
|
|
ptrace = 1;
|
|
}
|
|
|
|
/* slay zombie? */
|
|
if (exit_state == EXIT_ZOMBIE) {
|
|
/* we don't reap group leaders with subthreads */
|
|
if (!delay_group_leader(p)) {
|
|
/*
|
|
* A zombie ptracee is only visible to its ptracer.
|
|
* Notification and reaping will be cascaded to the
|
|
* real parent when the ptracer detaches.
|
|
*/
|
|
if (unlikely(ptrace) || likely(!p->ptrace))
|
|
return wait_task_zombie(wo, p);
|
|
}
|
|
|
|
/*
|
|
* Allow access to stopped/continued state via zombie by
|
|
* falling through. Clearing of notask_error is complex.
|
|
*
|
|
* When !@ptrace:
|
|
*
|
|
* If WEXITED is set, notask_error should naturally be
|
|
* cleared. If not, subset of WSTOPPED|WCONTINUED is set,
|
|
* so, if there are live subthreads, there are events to
|
|
* wait for. If all subthreads are dead, it's still safe
|
|
* to clear - this function will be called again in finite
|
|
* amount time once all the subthreads are released and
|
|
* will then return without clearing.
|
|
*
|
|
* When @ptrace:
|
|
*
|
|
* Stopped state is per-task and thus can't change once the
|
|
* target task dies. Only continued and exited can happen.
|
|
* Clear notask_error if WCONTINUED | WEXITED.
|
|
*/
|
|
if (likely(!ptrace) || (wo->wo_flags & (WCONTINUED | WEXITED)))
|
|
wo->notask_error = 0;
|
|
} else {
|
|
/*
|
|
* @p is alive and it's gonna stop, continue or exit, so
|
|
* there always is something to wait for.
|
|
*/
|
|
wo->notask_error = 0;
|
|
}
|
|
|
|
/*
|
|
* Wait for stopped. Depending on @ptrace, different stopped state
|
|
* is used and the two don't interact with each other.
|
|
*/
|
|
ret = wait_task_stopped(wo, ptrace, p);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/*
|
|
* Wait for continued. There's only one continued state and the
|
|
* ptracer can consume it which can confuse the real parent. Don't
|
|
* use WCONTINUED from ptracer. You don't need or want it.
|
|
*/
|
|
return wait_task_continued(wo, p);
|
|
}
|
|
|
|
/*
|
|
* Do the work of do_wait() for one thread in the group, @tsk.
|
|
*
|
|
* -ECHILD should be in ->notask_error before the first call.
|
|
* Returns nonzero for a final return, when we have unlocked tasklist_lock.
|
|
* Returns zero if the search for a child should continue; then
|
|
* ->notask_error is 0 if there were any eligible children,
|
|
* or still -ECHILD.
|
|
*/
|
|
static int do_wait_thread(struct wait_opts *wo, struct task_struct *tsk)
|
|
{
|
|
struct task_struct *p;
|
|
|
|
list_for_each_entry(p, &tsk->children, sibling) {
|
|
int ret = wait_consider_task(wo, 0, p);
|
|
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ptrace_do_wait(struct wait_opts *wo, struct task_struct *tsk)
|
|
{
|
|
struct task_struct *p;
|
|
|
|
list_for_each_entry(p, &tsk->ptraced, ptrace_entry) {
|
|
int ret = wait_consider_task(wo, 1, p);
|
|
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int child_wait_callback(wait_queue_entry_t *wait, unsigned mode,
|
|
int sync, void *key)
|
|
{
|
|
struct wait_opts *wo = container_of(wait, struct wait_opts,
|
|
child_wait);
|
|
struct task_struct *p = key;
|
|
|
|
if (!eligible_pid(wo, p))
|
|
return 0;
|
|
|
|
if ((wo->wo_flags & __WNOTHREAD) && wait->private != p->parent)
|
|
return 0;
|
|
|
|
return default_wake_function(wait, mode, sync, key);
|
|
}
|
|
|
|
void __wake_up_parent(struct task_struct *p, struct task_struct *parent)
|
|
{
|
|
__wake_up_sync_key(&parent->signal->wait_chldexit,
|
|
TASK_INTERRUPTIBLE, 1, p);
|
|
}
|
|
|
|
static long do_wait(struct wait_opts *wo)
|
|
{
|
|
struct task_struct *tsk;
|
|
int retval;
|
|
|
|
trace_sched_process_wait(wo->wo_pid);
|
|
|
|
init_waitqueue_func_entry(&wo->child_wait, child_wait_callback);
|
|
wo->child_wait.private = current;
|
|
add_wait_queue(¤t->signal->wait_chldexit, &wo->child_wait);
|
|
repeat:
|
|
/*
|
|
* If there is nothing that can match our criteria, just get out.
|
|
* We will clear ->notask_error to zero if we see any child that
|
|
* might later match our criteria, even if we are not able to reap
|
|
* it yet.
|
|
*/
|
|
wo->notask_error = -ECHILD;
|
|
if ((wo->wo_type < PIDTYPE_MAX) &&
|
|
(!wo->wo_pid || hlist_empty(&wo->wo_pid->tasks[wo->wo_type])))
|
|
goto notask;
|
|
|
|
set_current_state(TASK_INTERRUPTIBLE);
|
|
read_lock(&tasklist_lock);
|
|
tsk = current;
|
|
do {
|
|
retval = do_wait_thread(wo, tsk);
|
|
if (retval)
|
|
goto end;
|
|
|
|
retval = ptrace_do_wait(wo, tsk);
|
|
if (retval)
|
|
goto end;
|
|
|
|
if (wo->wo_flags & __WNOTHREAD)
|
|
break;
|
|
} while_each_thread(current, tsk);
|
|
read_unlock(&tasklist_lock);
|
|
|
|
notask:
|
|
retval = wo->notask_error;
|
|
if (!retval && !(wo->wo_flags & WNOHANG)) {
|
|
retval = -ERESTARTSYS;
|
|
if (!signal_pending(current)) {
|
|
schedule();
|
|
goto repeat;
|
|
}
|
|
}
|
|
end:
|
|
__set_current_state(TASK_RUNNING);
|
|
remove_wait_queue(¤t->signal->wait_chldexit, &wo->child_wait);
|
|
return retval;
|
|
}
|
|
|
|
static long kernel_waitid(int which, pid_t upid, struct waitid_info *infop,
|
|
int options, struct rusage *ru)
|
|
{
|
|
struct wait_opts wo;
|
|
struct pid *pid = NULL;
|
|
enum pid_type type;
|
|
long ret;
|
|
|
|
if (options & ~(WNOHANG|WNOWAIT|WEXITED|WSTOPPED|WCONTINUED|
|
|
__WNOTHREAD|__WCLONE|__WALL))
|
|
return -EINVAL;
|
|
if (!(options & (WEXITED|WSTOPPED|WCONTINUED)))
|
|
return -EINVAL;
|
|
|
|
switch (which) {
|
|
case P_ALL:
|
|
type = PIDTYPE_MAX;
|
|
break;
|
|
case P_PID:
|
|
type = PIDTYPE_PID;
|
|
if (upid <= 0)
|
|
return -EINVAL;
|
|
break;
|
|
case P_PGID:
|
|
type = PIDTYPE_PGID;
|
|
if (upid <= 0)
|
|
return -EINVAL;
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (type < PIDTYPE_MAX)
|
|
pid = find_get_pid(upid);
|
|
|
|
wo.wo_type = type;
|
|
wo.wo_pid = pid;
|
|
wo.wo_flags = options;
|
|
wo.wo_info = infop;
|
|
wo.wo_rusage = ru;
|
|
ret = do_wait(&wo);
|
|
|
|
put_pid(pid);
|
|
return ret;
|
|
}
|
|
|
|
SYSCALL_DEFINE5(waitid, int, which, pid_t, upid, struct siginfo __user *,
|
|
infop, int, options, struct rusage __user *, ru)
|
|
{
|
|
struct rusage r;
|
|
struct waitid_info info = {.status = 0};
|
|
long err = kernel_waitid(which, upid, &info, options, ru ? &r : NULL);
|
|
int signo = 0;
|
|
|
|
if (err > 0) {
|
|
signo = SIGCHLD;
|
|
err = 0;
|
|
if (ru && copy_to_user(ru, &r, sizeof(struct rusage)))
|
|
return -EFAULT;
|
|
}
|
|
if (!infop)
|
|
return err;
|
|
|
|
if (!user_access_begin(VERIFY_WRITE, infop, sizeof(*infop)))
|
|
return -EFAULT;
|
|
|
|
unsafe_put_user(signo, &infop->si_signo, Efault);
|
|
unsafe_put_user(0, &infop->si_errno, Efault);
|
|
unsafe_put_user(info.cause, &infop->si_code, Efault);
|
|
unsafe_put_user(info.pid, &infop->si_pid, Efault);
|
|
unsafe_put_user(info.uid, &infop->si_uid, Efault);
|
|
unsafe_put_user(info.status, &infop->si_status, Efault);
|
|
user_access_end();
|
|
return err;
|
|
Efault:
|
|
user_access_end();
|
|
return -EFAULT;
|
|
}
|
|
|
|
long kernel_wait4(pid_t upid, int __user *stat_addr, int options,
|
|
struct rusage *ru)
|
|
{
|
|
struct wait_opts wo;
|
|
struct pid *pid = NULL;
|
|
enum pid_type type;
|
|
long ret;
|
|
|
|
if (options & ~(WNOHANG|WUNTRACED|WCONTINUED|
|
|
__WNOTHREAD|__WCLONE|__WALL))
|
|
return -EINVAL;
|
|
|
|
/* -INT_MIN is not defined */
|
|
if (upid == INT_MIN)
|
|
return -ESRCH;
|
|
|
|
if (upid == -1)
|
|
type = PIDTYPE_MAX;
|
|
else if (upid < 0) {
|
|
type = PIDTYPE_PGID;
|
|
pid = find_get_pid(-upid);
|
|
} else if (upid == 0) {
|
|
type = PIDTYPE_PGID;
|
|
pid = get_task_pid(current, PIDTYPE_PGID);
|
|
} else /* upid > 0 */ {
|
|
type = PIDTYPE_PID;
|
|
pid = find_get_pid(upid);
|
|
}
|
|
|
|
wo.wo_type = type;
|
|
wo.wo_pid = pid;
|
|
wo.wo_flags = options | WEXITED;
|
|
wo.wo_info = NULL;
|
|
wo.wo_stat = 0;
|
|
wo.wo_rusage = ru;
|
|
ret = do_wait(&wo);
|
|
put_pid(pid);
|
|
if (ret > 0 && stat_addr && put_user(wo.wo_stat, stat_addr))
|
|
ret = -EFAULT;
|
|
|
|
return ret;
|
|
}
|
|
|
|
SYSCALL_DEFINE4(wait4, pid_t, upid, int __user *, stat_addr,
|
|
int, options, struct rusage __user *, ru)
|
|
{
|
|
struct rusage r;
|
|
long err = kernel_wait4(upid, stat_addr, options, ru ? &r : NULL);
|
|
|
|
if (err > 0) {
|
|
if (ru && copy_to_user(ru, &r, sizeof(struct rusage)))
|
|
return -EFAULT;
|
|
}
|
|
return err;
|
|
}
|
|
|
|
#ifdef __ARCH_WANT_SYS_WAITPID
|
|
|
|
/*
|
|
* sys_waitpid() remains for compatibility. waitpid() should be
|
|
* implemented by calling sys_wait4() from libc.a.
|
|
*/
|
|
SYSCALL_DEFINE3(waitpid, pid_t, pid, int __user *, stat_addr, int, options)
|
|
{
|
|
return kernel_wait4(pid, stat_addr, options, NULL);
|
|
}
|
|
|
|
#endif
|
|
|
|
#ifdef CONFIG_COMPAT
|
|
COMPAT_SYSCALL_DEFINE4(wait4,
|
|
compat_pid_t, pid,
|
|
compat_uint_t __user *, stat_addr,
|
|
int, options,
|
|
struct compat_rusage __user *, ru)
|
|
{
|
|
struct rusage r;
|
|
long err = kernel_wait4(pid, stat_addr, options, ru ? &r : NULL);
|
|
if (err > 0) {
|
|
if (ru && put_compat_rusage(&r, ru))
|
|
return -EFAULT;
|
|
}
|
|
return err;
|
|
}
|
|
|
|
COMPAT_SYSCALL_DEFINE5(waitid,
|
|
int, which, compat_pid_t, pid,
|
|
struct compat_siginfo __user *, infop, int, options,
|
|
struct compat_rusage __user *, uru)
|
|
{
|
|
struct rusage ru;
|
|
struct waitid_info info = {.status = 0};
|
|
long err = kernel_waitid(which, pid, &info, options, uru ? &ru : NULL);
|
|
int signo = 0;
|
|
if (err > 0) {
|
|
signo = SIGCHLD;
|
|
err = 0;
|
|
if (uru) {
|
|
/* kernel_waitid() overwrites everything in ru */
|
|
if (COMPAT_USE_64BIT_TIME)
|
|
err = copy_to_user(uru, &ru, sizeof(ru));
|
|
else
|
|
err = put_compat_rusage(&ru, uru);
|
|
if (err)
|
|
return -EFAULT;
|
|
}
|
|
}
|
|
|
|
if (!infop)
|
|
return err;
|
|
|
|
if (!user_access_begin(VERIFY_WRITE, infop, sizeof(*infop)))
|
|
return -EFAULT;
|
|
|
|
unsafe_put_user(signo, &infop->si_signo, Efault);
|
|
unsafe_put_user(0, &infop->si_errno, Efault);
|
|
unsafe_put_user(info.cause, &infop->si_code, Efault);
|
|
unsafe_put_user(info.pid, &infop->si_pid, Efault);
|
|
unsafe_put_user(info.uid, &infop->si_uid, Efault);
|
|
unsafe_put_user(info.status, &infop->si_status, Efault);
|
|
user_access_end();
|
|
return err;
|
|
Efault:
|
|
user_access_end();
|
|
return -EFAULT;
|
|
}
|
|
#endif
|
|
|
|
__weak void abort(void)
|
|
{
|
|
BUG();
|
|
|
|
/* if that doesn't kill us, halt */
|
|
panic("Oops failed to kill thread");
|
|
}
|
|
EXPORT_SYMBOL(abort);
|